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  #1  
Old August 13th, 2012, 12:42 PM
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Need help to check an ECU

Is anyone close to Baltimore (Bel Air specifically) with a 3.9l (preferably '95) that would mind checking to see if my ECU is toast by doing a 'plug in' test? I'm trying to eliminate the possibility of an ECU issue in a starting problem I'm having. I can drive to you with my ECU.
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  #2  
Old August 13th, 2012, 01:40 PM
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Could you make it to Falls Church for happy hour this thurs? I could bring a spare ECU and the rovergauge which we could inspect your ECU directly with as well.
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Old August 13th, 2012, 02:44 PM
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Hi Charles,

I can't make it this coming thursday, but I will be in/around Reston on either Tuesday or Thursday next week (not sure if that's near you). The 90 is not my daily driver, so not really a big deal for me to wait.

Thanks for the help in advance!

Chuck
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Old August 13th, 2012, 05:00 PM
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I'm working in Ashburn right now if you can make it that far from Reston during the day. PM or email me to sort out the details. charles at galpin dot org
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Old August 13th, 2012, 05:42 PM
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Does the Roverguage clear codes and reset the ECU?
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Old August 13th, 2012, 07:04 PM
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Yes it clears codes. Not 100% sure about resetting the CPU. What do you mean exactly?
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Old August 14th, 2012, 10:44 PM
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Reset the ECU is achieved by powering it off. It has no permanent memory ... The 02 code indicates its been cleared.

I know many people think the ECU has mythical powers but it's really just a pretty dumb box.

What is interesting is seeing if the ECU is in limp home mode. If some components fail the ECU inserts a default value ...

I'm not sure if libcomm reads limp mode.
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  #8  
Old August 15th, 2012, 06:18 AM
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If it was in "limp" mode the CEL would be on. That Roverguage is pretty interesting as it shows all the good info but there isn't much with a 14CUX that you cant pin out in about 5 min with a multimeter.......
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Old August 15th, 2012, 07:43 AM
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Quote:
Originally Posted by junkyddog11
If it was in "limp" mode the CEL would be on. That Roverguage is pretty interesting as it shows all the good info but there isn't much with a 14CUX that you cant pin out in about 5 min with a multimeter.......
Good luck pining out all the sensors while driving along ..
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old August 15th, 2012, 09:43 PM
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The rovergauge shows the fuel map in use and will display 0 when in limp home mode (according to Colin, the creator).
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  #11  
Old August 21st, 2012, 07:00 AM
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OK, so the ECU was plugged into another '95 90 and the truck immediately fired up. So, that's not my culprit for the 90 not starting. However, the other 90 did throw a 02 code when it was plugged in (same as in mine). Anybody have any thoughts on why I may not be able to start my 90? Again, not the battery and not the main power feed to the starter. When I go to engage the ignition, absolutely nothing happens. The other line to engage the starter is reading 0 volts when moved to the ignition position.
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Old August 21st, 2012, 07:18 AM
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02 is just the code that says "you unplugged me"

So the truck isn't running at all? There are large relays under the hood on the firewall directly in front of the driver. Start there, but otherwise start a no-start thread or see if others notice here.
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Old August 21st, 2012, 02:05 PM
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Nope, nothing at all. When I go to start the ignition, nothing happens...zilch. In the past when it's been the starter it's at least made some sort of noise (like the bendix just spinning). But now, nothing. Really odd and I've tried searching the forum for similar issues and cannot seem to locate anything. I'll open a new specific thread to garner better interest.
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Old August 21st, 2012, 02:08 PM
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Yeah that would be best. But check the main fuses, then verify at the back of the switch that it's working.
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Old August 21st, 2012, 02:55 PM
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try resetting the roll over switch
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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Old August 21st, 2012, 07:57 PM
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Good luck pining out all the sensors while driving along ..
That's pretty sweet but I've been fixing these for years and can't think why I would need to do any of that while driving. Especially curious as to how that would help diagnose a no start condition. Wasn't trying to be critical or anything.
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  #17  
Old August 21st, 2012, 08:22 PM
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Roll over switch? I like the suggestion (had to look it up b/c I wasn't even sure it had one), but isn't that a fuel thing? I wouldn't expect that the be the culprit because it's not even turning over. The engine does not crank at all.

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try resetting the roll over switch
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Old August 22nd, 2012, 08:03 AM
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Quote:
Originally Posted by junkyddog11
That's pretty sweet but I've been fixing these for years and can't think why I would need to do any of that while driving. Especially curious as to how that would help diagnose a no start condition. Wasn't trying to be critical or anything.
Sorry ... I have an excessively large sarcasm gene having been born in the UK ... I can't help myself sometimes.

Agreed no starts wouldnt benefit but I think you'd be surprised how informative a rover gauge is.

This no start seems like a no turn over. Going through this logically the ignition switch is the first and surprisingly common culprit.
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Soapy water / KY jelly, etc. is is basically a must. Yes, good idea to remove trim panels - only takes 5 more minutes to do so.
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  #19  
Old August 22nd, 2012, 08:08 AM
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Hey no worries.....I've been accused of a little over sarcasm myself. I also carry a British passport LOL.

------ Follow up post added August 22nd, 2012 08:10 AM ------

I also stock ignition switches. Seems they all need them.....that and fuel fill hoses.
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new expansion complete. Not only are we the only Rover shop in Eliot Maine...now we're also the biggest.

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  #20  
Old August 22nd, 2012, 08:37 AM
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Quote:
Originally Posted by rvrchuck
Roll over switch? I like the suggestion (had to look it up b/c I wasn't even sure it had one), but isn't that a fuel thing?
Not sure if it's fuel or spark but the engine would turn over (and not start).
Can you start the engine if you turn your key to the "run" position and put 12V to your starter?
Do you hear your fuel pump start when you first turn your key in the ignition?
When you turn the key to the off position, do you hear the main (fuel?) relay drop?
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